Adding-machine.



No. 883,719. PATENTED APR. 7, 1908. 'K. KARASEK & J. AUMUND.

ADDING MACHINE. APPLIUATION FILED MARIN, 190s.

Imveniorm= =======.aal. 1:5:

Karl Kev-Me a,

5Q homyes Au rmmd *Hneir Attorney I Tocll it may concern:

KARL KARASEK AND JOHANNES AUMUN D, OF ZURICH, SWITQEHLAND.

A DING-momma Specification of Letters Patent.

Patented April 7, 1908;

Application filed March 17', 1906. Serial No. 306,528-

Be it known that we, KARL KnnAsnK and I Jormmms AUMU'ND, citizens of Switzerland,

at Zurich, Switzerland,- have inventcertain new anduseful Improvementsin Addi ng-Machines, of which the following, is

p a s .ec fication.

I machines of.that class, in which a e present invention relates .to adding movable figure-disk is provided for'each figure of a number to be adde In adding machines of this character as heretofore constructed, it was necessary to look for the desired .number upon a circular figure plate, and then. to turn the latter against a pin or stop'. This 0 eration re quires the use of the eye, and t e operator must either bear in mind the number to be added until the addition is .completed, a

likely source of error, or, theoperator must frequently look from the written figure to the ompletion of the adding A machine, .occasioning a loss of time, and like wise tending to cause errors.

The apparatus forming the object, of the present invention may be readily operated, without the necessity of the operator looking at the apparatus, and includes meansv for proving the accuracy of the addition after 0 erationf In the accol'iipanying 5 one embodiment of the invention is illustrated, Figure 1 is a front view of the apparatus, partially in section. Fig. 2 is a cross sectional view; and Fig. 3 is.a top plan view .35.

with part of the casing removed, and parts of the apparatus being shown in section.

The mechanism for each place of a number to be added is alike, and but one set of mechanism is described in the following specifica tion.

Referring to the drawing, a, designates a casing, at a suitable point of which a shaft 6, is journaled,.theshaft being connected to a s iral spring 0, below a wall or diaphragm a and is provided at its free end with a crank he shaftfb, projects outside of the casin a, which is held, by spring actionagains't the pin 0, upon the'front of the casing. The

crank (1, travels over a dial upon the casing, u on which numbers from 0 to 9 appear. e crank normally points to 0 u on the dial.

Within the casing, and loose y mounted upon the shaft 12, on a common sleeve or have, is a ratchet wheel f, and a gear wheel-g.

rawing, wherein The shaft 1;, also carries a star wheel '5, upon which a pawl 1', held by a spri i, is secured, said awl cooplerating witht er'atchet wheel f9 he rate et wheel f, serves as means for lockin the adding mechanism in I provided upon its face with a series of fig ures from 0 to 9, one of which is always visible'through the opening 0 in the dial upon the casing at. There is also mounted upon theshaftm, a. dog p, which operates the ratchet of fthe next succeeding group of wheels 'andis adapted to advance the tens rou of figures. Furthermore, there is loose y mounted upon the shaft m, a lever g, having a nose g, which exerts a spring .pressure upon the star wheel 11. I

Arranged above the lever g, is a displaceable rail 1', common to the several groups of gear wheels, said rail being provided with pins 7", and a handle r WhlCh projects outside the casing a, and maybe operated by hand.

The operation of the invention is as fol,- lows Assuming that several figures are to be added, of which 4 is the first, the unit crank d, which is caused normally to. point to 0 by the spring 0, is turned to the figure 4 on a the dial and 1s then released. By turning the crank, the star wheel 2', is also caused to turn, and the nose 9 of the lever g, glides over the teeth of wheeli, and drops mto the roper position between two teeth, thus, holding the crank and figure-disk in the predetermined posipiou. The springaction of thelever g, alsoiserves to correct any slight inaccuracy of operation; if the crank (i is turned beyond a number the nose will between the teeth of the ratchet wheel and which engages draw the crank back so that it stands exactly over the. desired number. The turnin of the crank d, causes-the pawl i of thewheei, .to turn the wheels f and g the same distance as the wheel i, and as the wheel g is in mesh with the wheel n, the latter is turned a suificient distance to cause the figure .4 to a pear under the opening 0 upon the diaL.

. to tilt or trip the lever g, thus lifting the nose g against the tension of g out of engagement with the wheel, and permitting the spiral spring 0 to return the shaft 1) with the star wheel i, and crank d to their initial position. During the return travel of the crank d, the

awl i glides over the teeth of the wheel f, and the roller 70 upon the spring 7c, which engsriges a tooth of wheel f, holds the latter mly locked, and also holds thefigure-disk.

in osition.

f it is desired to add the figure 6 to the figure 4, the units crank is turned to the figure 6 upon the dial. The wheel n, thus completes the revolution theretofore begun, and the dog p engages one tooth of the wheel f of the tens gearing and advances this wheel one tooth. There then ap ears under the opening of the tens dial the gure 1 and at the opening of the units dial the figure 0. After the completion of this revolution, the dog is disengaged from the tens wheel f, Whic may then againbe independently operated.

One of the novel and important features of our invention is the form which we give the cranks d which serve as indices or pointers. In adding machines as heretofore constructed, the cranks were usually provided with a knob or rounded end, which it was necessary to grasp with two fingers, and consequently gave no indication in which direction the crank was pointing. According to our invention, however, we provide each crank with an u wardly extending, longitudinal rib (1, so t at the operator "may, by placing his-thumb on this rib, o erate the crank, and have his other fingers cc to grasp or rest upon the edge of the machine. In moving the crank, the longitudinal rib d moves under the operators thumb, and in this manner the operator is enabled by feel to accurately determine the direction in which the crank points, thus obviating the necessity of his looking at the macliineat each turn of the crank.

In releasing the tension of the lever g, by which action the nose 0 is caused .to drop, at each advance, behind a tooth of the star wheel, a decided resistance, of the crank (I, may be felt, by means of which the latter may be more readily placed in the desired position by touch. By aid of the arrange ment above described it is also possible toexamine the position of the several indices,

which remain in their res ective positions until all are simultaneous y released, and thus determine .the accuracy of the operation and if necessary to correct any figures erroneously set.

It will be understood that the invention as above. described is susceptible of modification in several particulars, and that such modifications are deemed to be included within the scope of the a pended claims.

Having thus describe( our invention what we claim as new and desire to secure by Letters Patent is:.

1. In an addin machine, the combination of a series of sha ts, a figure disk upon each shaft, a second series of shafts each of which is provided with gearing for 0 er'ating its suc-- ceedingly adjacent figure disk, and a detent upon each shaft of said first series for enga ing) the gearing upon the preceding shaf t, su stantially as described.

2. In an adding machine, the combination of a series of shafts, a peripherally toothed figure disk upon each shaft, a second series of shafts each of which is provided with gear wheels-of which one is adapted to mesh with and rotate the next succeedin fi ure disk, and a detent upon each shaft 0 said. first series for engaging the gearing upon the preceding shaft after the same has rotated one of said figure disks, substantially as described.

3. In an adding machine, the combination of a series of shafts, a figure disk upon each shaft, a second series of shafts each of which is provided with gearing for operating its succeedingly adjacent figure disk, a detent upon each shaft of said first series for enga ing the gearing upon the preceding shaft a ter the same has rotated one of said figure disks, and means for trippin the said detents, substantially as (l8SCI1l)6( 4. In an addin machine, the combination, of a series of sha ts, a figure disk upon each shaft, a second series of shafts arranged at a! lower horizontal lane than said first series, gearing upon eac shaft of said second series adapted to operate the figure disk upon the next succeeding shaft of said first series, and a detent upon each shaft of said first series adapted to engage the gearing upon the preceding shaft of said second series after the same has rotated one of said figure disks, substantially as described. v

p 5. In an adding machine, the combination of a series of shafts upon each of which a peripherally toothed figure disk is mounted, a

second series of shafts each of which carries a rigidly ilXGtl star wheel, and a loosely mountved ratchet wheel and gear wheel, the latter being adapted to mesh with an adjacent figure disk, means for rotating said several gear wheels to impart rotary motion to said figure disks, a detent upon each shaft of said first series for engaging the" preceding star wheel, and means for trip ing said detents after the figure disks have been set, substantially as described.

6. In an adding machine. the combination of a casing, a series of shafts journaled therein,

. a peri )herally toothed figure disk upon each said s aft. a second series of shafts journaled in said casing, each shaft of said second series carrying a rigidly fixed star wheel and a loosel mounted ratchet'wheel and gear Wheel, t e latter being adapted to mesh with tion to said figure disks, a detent upon an adjacent figure disk, means for rotating said several gear wheels to impart rotary rno-,

each

1 shaft of said first series for engaging the pie ceding star wheel, means for releasing said detent from engagement with, the star wheel,

and means for ocking said ratchet wheel to prevent reverse rotation of said'figu're disks,

' substantially as described.

gearing adapted to -i1re'. d1s s, adetent upon eac shaft upon; which said dog is mounted makes a complete revolution, substantially as describe;'

8. In a devi'ce'of the character described,

the combination of a ,shaft'carrying a star.

wheel anda car wheel, a figure-disk teeth adapte to meshwith said eargwt heel, means for releasing said star whee when said figure disk has been set, and means for hold-.-

ingsaid figure (liskfin set osition.

9. In a'devic e of the c aracter described, the combination of a shaft carrying toothed wheels, asecond shaft" carrying a figure disk I ada ted to be revolved by the wheels on sai first shaft, and a lever u on said second shaft, said lever being provi ed with a nose,

adapted to engage the teeth of one of the wheels upon said first shaft.

, 10. In a device of the character described,

the combination of a series of shafts, each carrying toothed wheel's, a second series of shafts, each having a figure disk and a lever mounted thereon, and a rail. common to all the levers, said rail being rovided with means for tripping th'e severa levers.

11. .In a device of the character described, .the combination of a series of shafts, each carrying a star wheel, and a loosely mounted gear wheel and ratchet wheel, a'second series of shafts, each of which is rovided with a figure disk having periphera teeth. designed to mesh with the next preceding gear wheel,

a lever provided with a nose, upon each shaft of said second series means for advancing said figure disks by rotation of the star wheels. means for holding said figure disks in set position, and means for releasing and're turning to initial position said star wheels.

12. In an adding machine of the character described, the combination ofindicating ,means, an operating device for said means,

comprising an arm movable in a circular path and formed on its upper surface with a vertical, longitudinall extending rib having downwardly inclined sides and of a length substantially co-extensive with that of the arm, saidrib being of substantially a uniform height. I p l I 13. In an adding machine of the characterdescribed including indicating mechanism and a dial, of an operating device for the indicating mechanism-i comprising a crank arm pivoted cent-rally of the dial and serving as a .poihter in connection with said dial, said arm hel ngformed on its upper surface with a /centrally located, longitudinally ex: tending rib of a length substantially coextensive with the length of the am, said rib having downwardly inclined side faces.

14. In a device'of the character described, the combination with a series of dials, of crahks adapted to travel thereover and to be set at any desired point thereon, and means for simultaneously releasing said cranks and "permitting thesame to return to initial position, substantially as described.

15. In a device of the character described,

the combination with a series of dials, of

cranks adapted to travel thereover and to be set at any desired point thereon, and means for simultaneously releasingv said cranks from their set osition, said means comprising a longitucli vided with stops at intervals thereon, substantially as described.

16. In an adding machine of the character described including indicating mechanism anda dial, of an operatingdevice for the 'indicating mechanism comprising a crank arm pivoted' at one 'end centrally of the dial and serving as a pointer in connection wlth said dial, said arm being formed on its upper surface with a longitudinally extending rib, substantially coextensive with the length of the arm and of substantially auni'form height.

'In testimony whereof we afiix our signatures in presence of two witnesses.

KARL KARASEK. J GHANNES AUMUND.

WVitnesses:

' H. Y. Hi'ILLER,

A. LIEBERKNECHT.

nally reciprocable rail pro- 

